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NVD / CVE Program· CNA GitLab

CVE-2025-12653: Authentication Bypass by Spoofing in GitLab

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.30% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: GitLab GitLab 18.4.5, 18.5.3, 18.6.1.

Low priority for now. Upgrade to GitLab GitLab 18.4.5, 18.5.3, 18.6.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Nov 26, 2025
Updated
Oct 18, 2026
EPSS
0.3% · 24th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitLab
6.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
gitlabgitlab

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • gitlab gitlab18.3.0 and later · before 18.4.5
  • gitlab gitlab18.5.0 and later · before 18.5.3
  • gitlab gitlab18.6.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitLab). Independent of NVD's CPE analysis and usually ahead of it.

  • GitLab GitLab

    • 18.3 and later · before 18.4.5affected · semver
    • 18.5 and later · before 18.5.3affected · semver
    • 18.6 and later · before 18.6.1affected · semver

Same product

gitlab: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-22205An issue has been discovered in GitLab CE/EE affecting all versions starting from 11.9.KEV
    100Now
  • CVE-2026-85706Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in GitLabKEV
    99Now
  • CVE-2023-7028Weak Password Recovery Mechanism for Forgotten Password in GitLabKEV
    97Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-9825Nov 21, 2025 · Missing Authorization in GitLab
    26Monitor
  • ← EarlierCVE-2025-12571Nov 26, 2025 · Allocation of Resources Without Limits or Throttling in GitLab
    30Monitor
  • Later →CVE-2025-13611Nov 26, 2025 · Insertion of Sensitive Information into Log File in GitLab
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
GitLab GitLab18.4.5Vendor (CNA)
GitLab GitLab18.5.3Vendor (CNA)
GitLab GitLab18.6.1Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-6678440 days apartAuthentication Bypass by Spoofing in GitLab
    36Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2025-645475 days apartServer-Side Request Forgery (SSRF) in GitLab
    35Monitor
  • CVE-2025-1257577 days apartServer-Side Request Forgery (SSRF) in GitLab
    21Monitor
  • CVE-2025-1207377 days apartServer-Side Request Forgery (SSRF) in GitLab
    17Monitor
  • CVE-2025-694511 days apartImproper Neutralization of Special Elements used in a Command ('Command Injection') in GitLab
    14Monitor

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-290 · Authentication Bypass by Spoofing

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records