CVE-2026-3254

lowpriority · track · 0EPSS 0.002 · 4 %ileDEEUNLUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.15% (4th) EPSS

CVSS 3.5 · low

Is it mine?

10 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · cert_bund · ncsc_nl

EPSS · scored 2026-10-27

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to load unauthorized content into another user's browser due to improper input validation in the Mermaid sandbox.

cvss

Technical severity, 0–10. One row per scoring source.

3.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.13.5lowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:Nsecondary · ENISA EU

v3.13.5lowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:Nsecondary · cve@gitlab.comexploitability 2.1 · impact 1.4

v3.13.2lowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.13.5lowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:Nsecondary · NCSC-NL NL

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1021USCWE-1021US

affected products (10)

Products and version ranges known to be affected.

Open Source GitLab <18.10.4all versionscert_bundDE
Open Source GitLab <18.11.1all versionscert_bundDE
Open Source GitLab <18.9.6all versionscert_bundDE
Open Source GitLab< 18.10.4cert_bundDE
Open Source GitLab< 18.11.1cert_bundDE
Open Source GitLab< 18.9.6cert_bundDE
GitLab GitLab18.11 → 18.11.1enisa_euvdEU
GitLab GitLab≤ vers:unknown/*ncsc_nlNL
gitlab gitlab= 18.11.0nvdUScpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
Bitnami gitlab18.11.0 → 18.11.1osvUSpkg:bitnami/gitlab

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2026-0128Kwetsbaarheden verholpen in GitLab EE en CENL2026-04-23csaf · ncsc_nlNL
GitLab Inc. heeft meerdere kwetsbaarheden verholpen in GitLab Community Edition en Enterprise Edition, specifiek in versies variërend van 9.2 tot voor 18.11.1, inclusief diverse 18.x releases.
WID-SEC-W-2026-1245GitLab: Mehrere SchwachstellenDeutsch2026-04-22csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in GitLab ausnutzen, um beliebigen Programmcode auszuführen, Daten zu manipulieren, vertrauliche Informationen offenzulegen, Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand zu verursachen oder Cross-Site-Scripting-Angriffe durchzuführen.
BIT-gitlab-2026-3254Improper Restriction of Rendered UI Layers or Frames in GitLab2026-04-24vendor · osvUS
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to load unauthorized content into another user's browser due to improper input validation in the Mermaid sandbox.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund ncsc_nl nvd osv NVD CVE.org MITRE

published 2026-04-22modified 2026-06-17

references (6)

External citations — patches, advisories, analysis.

scry

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