CVE-2025-8550: A vulnerability was found in atjiu pybbs up to 6.0.0

Q: How do I fix CVE-2025-8550?

pybbs: upgrade to newer than 6.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-8550 being exploited?

CVE-2025-8550 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-8550 affect?

CVE-2025-8550 affects pybbs. Severity is low (CVSS 2.4). 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 si

Q: How urgent is CVE-2025-8550?

Priority 27/100. Public exploit reference

Routine

LOW 2.4UPGRADE

CVE-2025-8550 is a low-severity flaw (CVSS 2.4) affecting pybbs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 t

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	2.4 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79, CWE-94
Published	2025-08-05
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: pybbs project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-05 07:15 UTCPublished CVE record published
2026-06-17 10:07 UTCUpdated Record last modified

pybbs project pybbs UPGRADE

Affected: <= 6.0.0

Fixed in: newer than 6.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pybbs || rpm -q pybbs || pybbs --version

2. UPGRADE to newer than 6.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pybbs

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pybbs

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: atjiu pybbs 6.0.0 - Cross Site Scripting (XSS)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-8550?

pybbs: upgrade to newer than 6.0.0. Exact commands for each OS are on this page.

Is CVE-2025-8550 being exploited?

CVE-2025-8550 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-8550 affect?

CVE-2025-8550 affects pybbs. Severity is low (CVSS 2.4). 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 si

How urgent is CVE-2025-8550?

Priority 27/100. Public exploit reference

Related CVEs

CVE-2025-12297 MEDIUM 4.3 UPGRADE A vulnerability was detected in atjiu pybbs up to 6.0.0
CVE-2025-8814 MEDIUM 4.3 UPGRADE A vulnerability was found in atjiu pybbs up to 6.0.0 and classified as problematic
CVE-2025-8813 LOW 3.5 UPGRADE A vulnerability has been found in atjiu pybbs up to 6.0.0 and classified as problematic
CVE-2025-8812 LOW 2.4 UPGRADE A vulnerability, which was classified as problematic, was found in atjiu pybbs up to 6.0.0
CVE-2025-8555 LOW 3.5 UPGRADE A vulnerability, which was classified as problematic, was found in atjiu pybbs up to 6.0.0

References

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