What is CVE-2023-22527?

CVE-2023-22527 is Atlassian Confluence Data Center and Server Template Injection Vulnerability. The supplied enrichment data classifies it as Injection mapped to CWE-74 Injection.

Which versions are affected?

Affected product and version evidence is listed in the product table above. Current public advisories should be checked for exact version scope before patch targeting is finalized.

Is there active exploitation?

Yes: CISA KEV signal present. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

Is there a public exploit?

121 public PoC repositories reported; 1 marked weaponized in current dataset. Public exploit or PoC availability should raise triage priority, especially for exposed or business-critical systems.

How can defenders detect it?

Start with web/proxy/WAF logs, application logs, network IDS/IPS, database audit logs where available. Look for vulnerability-class behavior, product errors, suspicious authentication events, exploit probes, and abnormal process activity based only on evidence that applies to the affected product.

How should teams prioritize it?

Prioritize CVE-2023-22527 using CVSS 9.8, EPSS 100%, KEV status, public PoC status, and asset exposure. Internet-facing, privileged, or business-critical deployments should be handled first.

Are workarounds available?

The supplied mitigation guidance says to apply vendor patches and restrict external exposure until fixed. Fixed-version evidence is listed in the mitigation section above.

Which threat actors are linked publicly?

Publicly linked actor or ransomware signals in the supplied enrichment data: APT 29 (), LUNAR SPIDER (), Shadow Network (), Operation Harvest (), Hacking Team (), Ransomware use: Known. Do not attribute exploitation to a threat actor unless the source evidence explicitly supports that linkage.

What should be done in the next 24 hours?

Identify exposed assets running affected vendor/product/version combinations. Treat as emergency remediation because CISA KEV status is present. Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class. Open remediation tickets with affected assets, owners, evidence status, and detection coverage so decisions are traceable.

CISA KEVRansomwarecriticalInjectionpublic exploit

CVE-2023-22527

CVE-2023-22527 — Atlassian Confluence Data Center and Server Template Injection Vulnerability

Q: Is it in CISA KEV?

Yes. The supplied enrichment data lists CVE-2023-22527 in CISA KEV with required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

A template injection vulnerability on older versions of Confluence Data Center and Server allows an unauthenticated attacker to achieve RCE on an affected instance. Customers using an affected version must take immediate action. Most recent supported versions of Confluence Data Center and Server are not affected by this vulnerability as it was ultimately mitigated during regular version updates. However, Atlassian recommends that customers take care to install the latest version to protect their instances from non-critical vulnerabilities outlined in Atlassian’s January Security Bulletin.

Published Jan 16, 2024Updated Jun 17, 2026Sources: NVD, Atlassian (CNA), CISA, FIRST EPSS, GitHub, SOCRadar CTI

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Confirmed

CISA KEV, listed Jan 24, 2024

EPSS

100%

top of FIRST's scoreset

Affects

Atlassian

25 products listed

CVSS base

9.8

critical · 2 sources

CISA SSVC assessment

Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.

CISA

Exploitation

Active

none · proof-of-concept · active

Automatable

Yes

can an attacker script all four kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

The vendor's own words where we have them.

Upgrade Confluence Data Center to a fixed release (< 8.0.0). Apply vendor patches per advisory and restrict external exposure of the affected component until patched.

CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Federal deadline Feb 14, 2024 — passed 943 days ago

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

Identify exposed assets running affected vendor/product/version combinations.
Treat as emergency remediation because CISA KEV status is present.
Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

Vendor	Product	Versions	Status
Atlassian	Confluence Data Center	< 8.0.0	Patched
Atlassian	Confluence Data Center	>= 8.0.0	Vulnerable
Atlassian	Confluence Data Center	>= 8.1.0	Vulnerable
Atlassian	Confluence Data Center	>= 8.2.0	Vulnerable
Atlassian	Confluence Data Center	>= 8.3.0	Vulnerable
Atlassian	Confluence Data Center	>= 8.4.0	Vulnerable
Atlassian	Confluence Data Center	>= 8.5.0	Vulnerable
Atlassian	Confluence Data Center	>= 8.5.1	Vulnerable
Atlassian	Confluence Data Center	>= 8.5.2	Vulnerable
Atlassian	Confluence Data Center	>= 8.5.3	Vulnerable
Atlassian	Confluence Data Center	>= 8.5.4	Patched
Atlassian	Confluence Data Center	>= 8.6.0	Patched

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Availability

High

Confidentiality

High

Integrity

High

Scope

Unchanged

Attack Complexity

Low

Attack Vector

Network

Privileges Req

None

User Interaction

None

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
9.8	CVSS 3.1	critical	3.9	5.9	NVD
10	CVSS 3.0	critical	3.9	6	Atlassian (CNA)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What this weakness leads to

MITRE's own consequences and mitigations for the weakness class — the authority's wording, not guidance derived from the CVSS vector.

MITRE

CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Read Application Data
Bypass Protection Mechanism
Alter Execution Logic
Other

Mitigation: Programming languages and supporting technologies might be chosen which are not subject to these issues.

Weakness & attack patterns

CWE-74Injection

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

CAPEC-267 · Leverage Alternate EncodingCAPEC-71 · Using Unicode Encoding to Bypass Validation LogicCAPEC-46 · Overflow Variables and TagsCAPEC-83 · XPath InjectionCAPEC-3 · Using Leading 'Ghost' Character Sequences to Bypass Input FiltersCAPEC-273 · HTTP Response SmugglingCAPEC-13 · Subverting Environment Variable ValuesCAPEC-8 · Buffer Overflow in an API CallCAPEC-250 · XML InjectionCAPEC-47 · Buffer Overflow via Parameter ExpansionCAPEC-52 · Embedding NULL BytesCAPEC-42 · MIME Conversion

T1562.003Impair Defenses: Impair Command History Logging
T1574.006Hijack Execution Flow: Dynamic Linker Hijacking
T1574.007Hijack Execution Flow: Path Interception by PATH Environment Variable

CISA KEV details

CISA lists a CVE here once it has evidence of exploitation against real targets.

CISAThat month →

Listed

Jan 24, 2024

Federal deadline

Feb 14, 2024

passed 943 days ago

Ransomware use

Known

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a date to argue against.

Public exploit

Capability, not use: code existing is a different claim from anyone running it.

Repositories

1 of the 5 sampled are weaponized

Exploit entries

Exploit-DB and CTI exploit indexes

Malware

Families a CTI source ties to this CVE. One named, with the total it tracks.

Families tracked

Named

AnyDesk

Social mentions

Posts naming this CVE. Attention, not evidence of exploitation — it spikes on disclosure and decays whether or not anything is exploited.

Detection

Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.

Prioritize edge telemetry for network-reachable Confluence Data Center, Confluence Server.
Monitor for scanner or exploit-pattern traffic after 121 public PoC repositories were reported.

web/proxy/WAF logsapplication logsnetwork IDS/IPSdatabase audit logs

Groups associated with this CVE

Groups reported in connection with this vulnerability. A reported association, not a confirmed observation of that group using it — and not scoped to any sector or campaign.

APT 29LUNAR SPIDERShadow NetworkOperation HarvestHacking Team

2 more threat groups on this CVEShowing 5 of 7 · Attribution, campaigns and the malware each one runsUnlock free

ip91.191.209.4645
CTU-AIPP-BlackList-4 · Apr 1, 2022
hash54daad58cce5003bee58b28a4f465f4999
SOCRadar Threat Exchange Services · Apr 20, 2023
hash162b08b0b11827cc024e6b2eed5887ec86339baa99
SOCRadar Threat Exchange Services · Apr 20, 2023
ip109.235.7.16136
Kaspersky Public Requests · Aug 26, 2020
hostnamerequests.post34
SOCRadar IOC Vulnerabilities Firehol · Mar 30, 2025

5 more indicators on this CVEShowing 5 of 10 · Hashes, addresses and domains from a live threat exchangeUnlock free

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

2026
Added · CVSS 3.1 9.8 (AV:N)
Jun 17, 2026 · NVD
Cve is exploited mylo-2001/AtlassianPwn
May 9, 2026 · SOCRadar CTI
2025
Bulletin released on NIST.
Oct 16, 2025 · SOCRadar CTI
Bulletin released on NIST.
Oct 16, 2025 · SOCRadar CTI
2024
Added to CISA KEV catalog
Jan 24, 2024 · CISA
Initial · CVE published
Jan 16, 2024 · NVD

Source activity

Readings a source repeats on a schedule, counted rather than listed.

13×SVRS was changedMay 21, 2025 – May 9, 2026 · SOCRadar CTI
10×TweetsMay 19, 2025 – Jul 13, 2026 · SOCRadar CTI
3×Github ReposMay 29, 2025 – May 6, 2026 · SOCRadar CTI

References

7 on the record

packetstormsecurity.com/files/176789/Atlassian-Confluence-SSTI-Injection.html
Exploit, Third Party Advisory, VDB Entry, NIST, GITHUB
confluence.atlassian.com/pages/viewpage.action?pageId=1333335615
Vendor Advisory, NIST, MITRE
jira.atlassian.com/browse/CONFSERVER-93833
Issue Tracking, Vendor Advisory, NIST, MITRE
www.vicarius.io/vsociety/posts/pwning-confluence-via-ognl-injection-for-fun-and-learning-cve-2023-22527
Exploit, NIST, GITHUB
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-22527
US Government Resource
confluence.atlassian.com/security/cve-2023-22527-rce-remote-code-execution-vulnerability-in-confluence-data-center-and-confluence-server-1333990257.html
Vendor Advisory
nvd.nist.gov/vuln/detail/CVE-2023-22527
Vendor Advisory

Coverage

6 stories from the feeds we poll

1 more reports on this CVEShowing 5 of 6 · Vendor research and security press coverageUnlock free

Elsewhere on this site

Atlassianevery CVE for this vendor
January 2024what else CISA listed
Injectionsame class
CWE-74other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

Only the 5 indicator(s) reported for this CVE are available; no packet-level or host-forensic artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record1

What should defenders know first?

CVE-2023-22527 is Atlassian Confluence Data Center and Server Template Injection Vulnerability, a critical vulnerability affecting Confluence Data Center, Confluence Server from Atlassian. The current evidence lists it in CISA KEV, and the exploit status is: Yes: CISA KEV signal present. Public exploit evidence is: 121 public PoC repositories reported; 1 marked weaponized in current dataset. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 9.8 describes technical severity, while EPSS 100% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.