CVE-2026-4495
CVE-2026-4495 — atjiu pybbs CommentApiController.java create cross site scripting
A security flaw has been discovered in atjiu pybbs 6.0.0. This impacts the function create of the file src/main/java/co/yiiu/pybbs/controller/api/CommentApiController.java. The manipulation results in cross site scripting. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks.
Published Updated Sources: cvelistV5, VulDB
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
0%
chance of exploitation in 30 days
CVSS base
3.5
LOW
CISA SSVC assessment
Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.
Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script all four kill-chain steps
Technical impact
Partial
partial · total control of the vulnerable component
Affected scope
The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.
Vendors (1)
Products (1)
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 |
|---|---|---|---|---|---|
| 3.5 | CVSS 3.1 | LOW | — | — | cvelistV5 |
Weakness & attack patterns
- CWE-79
- CWE-94
Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.
- T1027.006Obfuscated Files or Information: HTML Smuggling
- T1027.009Obfuscated Files or Information: Embedded Payloads
- T1564.009Hide Artifacts: Resource Forking
Detection
Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.
- Search application, proxy, and WAF logs for requests touching /main/java/co/yiiu/pybbs/controller/api/CommentApiController.java.
References
4 on the record
- vuldb.com/?id.352021
vdb-entry, technical-description
- vuldb.com/?ctiid.352021
signature, permissions-required
- vuldb.com/?submit.773780
third-party-advisory
- fx4tqqfvdw4.feishu.cn/docx/PN3YdPBpsowyU1xTV1VcVTm9nzg?from=from_copylink
exploit
Elsewhere on this site
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.