What is CVE-2026-88891?

CVE-2026-88891 is OpenPanel Read-Only Access Level Enforcement Bypass via Mutations. The supplied enrichment data classifies it as Privilege Esc mapped to CWE-269 Improper Privilege Management.

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?

Active exploitation is not confirmed from current sources for CVE-2026-88891. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

No. CVE-2026-88891 is not listed in CISA KEV in the supplied enrichment data. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

Is there a public exploit?

A public PoC is not confirmed from current sources for CVE-2026-88891. 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, EDR process telemetry, host service 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-2026-88891 using CVSS 8.3, EPSS 0%, 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?

No public threat actor linkage is confirmed from current sources. 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. Prioritize based on EPSS, PoC availability, and external exposure. 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.

highPrivilege Esc

CVE-2026-88891

CVE-2026-88891 — OpenPanel Read-Only Access Level Enforcement Bypass via Mutations

OpenPanel fails to enforce read-only project access level on 26 of 29 mutating procedures, allowing read-level members to modify, delete, and publish project data. Attackers with explicit read-only access can delete reports and dashboards, schedule entire projects for deletion, publish private analytics to public share links, and modify alerting rules by exploiting missing access level validation in mutation resolvers.

Published Sep 10, 2026Updated Sep 10, 2026Sources: NVD, Openpanel-dev (CNA), GitHub, GitHub Security Advisory, SOCRadar CTI

Triage

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

Exploitation

Unreported

no source claims exploitation

EPSS

ahead of 0% of scored CVEs

Affects

Openpanel-dev

openpanel

CVSS base

8.3

high · 2 sources

Remediation

The vendor's own words where we have them.

Upgrade openpanel to a fixed release. Apply vendor patches per advisory and restrict external exposure of the affected component until patched.

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.
Prioritize based on EPSS, PoC availability, and external exposure.
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
Openpanel-dev	openpanel	0	Vulnerable

Attack characteristics

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

Availability

High

Confidentiality

Low

Integrity

High

Scope

Unchanged

Attack Complexity

Low

Attack Vector

Network

Privileges Req

Low

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
8.3	CVSS 3.1	high	2.8	5.5	NVD, Openpanel-dev (CNA), GHSA
7.2	CVSS 4.0	high	—	—	Openpanel-dev (CNA)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-269 · Improper Privilege Management

Gain Privileges or Assume Identity::

Mitigation: Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.

Weakness & attack patterns

CWE-269Improper Privilege Management

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

CAPEC-122 · Privilege AbuseCAPEC-58 · Restful Privilege ElevationCAPEC-233 · Privilege Escalation

T1548Abuse Elevation Control Mechanism

Detection

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

Prioritize edge telemetry for network-reachable openpanel.
Review endpoint telemetry for service binary replacement, suspicious service launches, or privilege changes tied to the affected agent.

web/proxy/WAF logsapplication logsnetwork IDS/IPSEDR process telemetryhost service logs

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 8.3 (AV:N)
Sep 10, 2026 · NVD
Initial · CVE published
Sep 10, 2026 · NVD
Added · GHSA-hpwh-25jq-4wxm published (high)
Sep 10, 2026 · GitHub Security Advisory
CVE published by MITRE.
Sep 10, 2026 · SOCRadar CTI

References

4 on the record

github.com/Openpanel-dev/openpanel/security/advisories/GHSA-f9rx-pxgw-c6rg
Exploit, Third Party Advisory, Mitre
www.vulncheck.com/advisories/openpanel-read-only-access-level-enforcement-bypass-via-mutations
Vendor Advisory, Mitre
nvd.nist.gov/vuln/detail/CVE-2026-88891
NVD
github.com/advisories/GHSA-hpwh-25jq-4wxm
Exploit, Third Party Advisory

Elsewhere on this site

Openpanel-devevery CVE for this vendor
Privilege Escsame class
CWE-269other 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.

No confirmed IOCs, IP addresses, domains, file hashes, or malware 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-2026-88891 is OpenPanel Read-Only Access Level Enforcement Bypass via Mutations, a high vulnerability affecting openpanel from Openpanel-dev. The current evidence does not list it in CISA KEV, and the exploit status is: Active exploitation is not confirmed from current sources for CVE-2026-88891. Public exploit evidence is: A public PoC is not confirmed from current sources for CVE-2026-88891. 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 8.3 describes technical severity, while EPSS 0% 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.