Vulnerability · Published Mar 20, 2026 · Assigned by VulDB
CVE-2026-4494atjiu pybbs TopicApiController.java create cross site scripting
Low 3.5
In plain English
A low-severity cross-site scripting in pybbs from atjiu. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Severity (CVSS 3.1)3.5Low
Exploit odds (30 days)0.3%top 76.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
A vulnerability was identified in atjiu pybbs 6.0.0. This affects the function create of the file src/main/java/co/yiiu/pybbs/controller/api/TopicApiController.java. The manipulation leads to cross site scripting. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.
Affected products (as reported)
Weakness: CWE-79, CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
References
- VDB-352020 | atjiu pybbs TopicApiController.java create cross site scripting vdb-entry, technical-description
- VDB-352020 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
- Submit #773779 | atjiu pybbs 6.0.0 Improper Neutralization of Alternate XSS Syntax third-party-advisory
- https://fx4tqqfvdw4.feishu.cn/docx/EKVgdqWIzo70C0xB5jxcb4IZnre?from=from_copylink exploit