RCE in Postybirb Plus
CVE-2026-120190
A security flaw has been discovered in PostyBirb Plus up to 3.1.75. Affected by this vulnerability is an unknown functionality of the file ui/src/views/submissions/submission-forms/form-components/DescriptionInput.tsx of the component Submission Description Editor. The manipulation results in cross site scripting. The attack may be performed from remote. The exploit has been released to the public and may be used for attacks. Upgrading to version 3.1.76 addresses this issue. The patch is identified as 6b11c2345ad98ae59fd5404a9f1024eb1d10c8a4. It is advisable to upgrade the affected component.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Postybirb Plus — versions 3.1.0, 3.1.1, 3.1.10
Weakness classification (CWE)
References
- vuldb.com/vuln/429529 (vdb-entry)
- vuldb.com/vuln/429529/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-120190 (third-party-advisory)
- vuldb.com/submit/1027356 (third-party-advisory)
- github.com/mvdicarlo/postybirb-plus/issues/504 (issue-tracking)
- github.com/mvdicarlo/postybirb-plus/pull/506 (issue-tracking, patch)
- github.com/user-attachments/files/32685547/report.md (exploit)
- github.com/mvdicarlo/postybirb-plus/commit/6b11c2345ad98ae59fd5404a9f1024eb1d10… (patch)
- github.com/mvdicarlo/postybirb-plus/releases/tag/v3.1.76 (patch)
Frequently asked questions
- What is CVE-2026-120190?
- CVE-2026-120190 is a low-severity vulnerability in Postybirb Plus, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-11-01.
- How severe is CVE-2026-120190?
- Low severity. CVSS v3 base score is 3.5 out of 10.