CVE-2026-120190: PostyBirb Plus

PostyBirb Plus Submission Description Editor DescriptionInput.tsx cross site scripting

CVSS 5.1 MediumEPSS 0.0039 · 33rd percentile

Published by the CVE Program (CNA: VulDB) at 1 Nov 2026, 00:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Not given	PostyBirb Plus	affected 3.1.0 affected 3.1.1 affected 3.1.2 affected 3.1.3 affected 3.1.4 affected 3.1.5 affected 3.1.6 affected 3.1.7 affected 3.1.8 affected 3.1.9 affected 3.1.10 affected 3.1.11 and 65 more

Identifiers

CVE-2026-120190

CNA

VulDB

Weakness (CWE)

CWE-79 · CWE-94

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.1	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P	CNA (VulDB)Used for this record
3.5	Low	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C	CNA (VulDB)
3.5	Low	3.0	CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C	CNA (VulDB)
4.0	Medium	2.0	AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:OF/RC:C	CNA (VulDB)

CISA KEV Not listed.
EPSS 0.0039, the 33rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1 Nov 2026, 00:30 UTC Confirmed by the CVE List
1 Nov 2026, 00:35 UTC First seen by agentprime
1 Nov 2026, 01:17 UTC Confirmed by NVD

Sources

References from the CNA

vuldb.com/vuln/429529 vdb-entry
vuldb.com/vuln/429529/cti signaturepermissions-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-trackingpatch
github.com/mvdicarlo/postybirb-plus/commit/6b11c2345ad98ae59fd5404a9f1024eb1d10c8a4 patch
github.com/mvdicarlo/postybirb-plus/releases/tag/v3.1.76 patch
github.com/user-attachments/files/32685547/report.md exploit

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.