CVE-2026-4398: Authorization Bypass Through User-Controlled Key in GitLab
Noroxi assessment
Priority: Monitor (action score 21/100)
- 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: 0.24% (FIRST EPSS).
- Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: GitLab GitLab 19.1.7, 19.2.5, 19.3.1.
Low priority for now. Upgrade to GitLab GitLab 19.1.7, 19.2.5, 19.3.1 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 EE affecting all versions from 18.3 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user could have assigned compliance frameworks from namespaces they were not authorized to access to their own project, due to missing namespace validation on self-managed instances.
- Published
- Apr 8, 2026
- Updated
- Sep 28, 2026
- EPSS
- 0.2% · 15th percentile
- CWE
- CWE-639
Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.4 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · GitLab
- 5.4
- 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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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.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| gitlab | gitlab | cpe:2.3:a:gitlab:gitlab |
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 19.1.7
- gitlab gitlab19.2.0 and later · before 19.2.5
- gitlab gitlab19.3.0
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 19.1.7affected · semver
- 19.2 and later · before 19.2.5affected · semver
- 19.3 and later · before 19.3.1affected · semver
Same product
gitlab: all recordsOther 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.KEV100Now
- CVE-2026-85706Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in GitLabKEV99Now
- CVE-2023-7028Weak Password Recovery Mechanism for Forgotten Password in GitLabKEV97Now
Published before and after this one in the same product
- ← EarlierCVE-2026-4916Apr 8, 2026 · Missing Authorization in GitLab10Monitor
- ← EarlierCVE-2026-5173Apr 8, 2026 · Exposed Dangerous Method or Function in GitLab34Monitor
- Later →CVE-2026-1660Apr 22, 2026 · Allocation of Resources Without Limits or Throttling in GitLab26Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| GitLab GitLab | 19.1.7 | Vendor (CNA) |
| GitLab GitLab | 19.2.5 | Vendor (CNA) |
| GitLab GitLab | 19.3.1 | Vendor (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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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 researchersFinders, 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-2026-19228126 days apartAuthorization Bypass Through User-Controlled Key in GitLab34Monitor
- CVE-2026-486849 days apartAuthorization Bypass Through User-Controlled Key in GitLab32Monitor
- CVE-2025-8770238 days apartAuthorization Bypass Through User-Controlled Key in GitLab26Monitor
- CVE-2026-530978 days apartAuthorization Bypass Through User-Controlled Key in GitLab21Monitor
- CVE-2024-10925401 days apartAuthorization Bypass Through User-Controlled Key in GitLab21Monitor
- CVE-2026-21040 days apartAuthorization Bypass Through User-Controlled Key in GitLab17Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
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.
- A low-privileged account is enough.
- 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-639 · Authorization Bypass Through User-Controlled KeyCVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
nvd-secondary
Root cause
The endpoint fetches the record by the ID sent in the request, but never checks whether the record belongs to the requesting user.
The bug in code
The whole CWE-639 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
const invoice = await Invoice.findById(req.params.id);
res.json(invoice);Fixed
const invoice = await Invoice.findOne({
id: req.params.id,
ownerId: req.user.id,
});
if (!invoice) return res.sendStatus(404);
res.json(invoice);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (2 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.