Eclipse Theia preview.yml pull_request_target inclusion of functionality from untrusted control sphere

CVSS Meta Temp Score
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CTI Interest Score
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8.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Eclipse Theia. This vulnerability affects the function pull_request_target of the file github/workflows/preview.yml. This manipulation causes inclusion of functionality from untrusted control sphere. The identification of this vulnerability is CVE-2026-1699. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in Eclipse Theia (version now known) and classified as critical. Affected by this vulnerability is the function pull_request_target of the file github/workflows/preview.yml. The manipulation with an unknown input leads to a inclusion of functionality from untrusted control sphere vulnerability. The CWE definition for the vulnerability is CWE-829. The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Eclipse Theia Website repository, the GitHub Actions workflow .github/workflows/preview.yml used pull_request_target trigger while checking out and executing untrusted pull request code. This allowed any GitHub user to execute arbitrary code in the repository's CI environment with access to repository secrets and a GITHUB_TOKEN with extensive write permissions (contents:write, packages:write, pages:write, actions:write). An attacker could exfiltrate secrets, publish malicious packages to the eclipse-theia organization, modify the official Theia website, and push malicious code to the repository.

The weakness was shared by Barak Haryati as 332. The advisory is shared at gitlab.eclipse.org. This vulnerability is known as CVE-2026-1699 since 01/30/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Applying the patch 2fb0cc4bfc372cfaef79feb4eebb6563778b2560 is able to eliminate this problem.

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Productinfo

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.7
VulDB Meta Temp Score: 8.6

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔒

CNA Base Score: 10.0
CNA Vector (eclipse): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Inclusion of functionality from untrusted control sphere
CWE: CWE-829
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 2fb0cc4bfc372cfaef79feb4eebb6563778b2560

Timelineinfo

01/30/2026 Advisory disclosed
01/30/2026 +0 days CVE reserved
01/30/2026 +0 days VulDB entry created
03/11/2026 +40 days VulDB entry last update

Sourcesinfo

Advisory: 332
Researcher: Barak Haryati
Status: Confirmed

CVE: CVE-2026-1699 (🔒)
GCVE (CVE): GCVE-0-2026-1699
GCVE (VulDB): GCVE-100-343489

Entryinfo

Created: 01/30/2026 11:53
Updated: 03/11/2026 01:16
Changes: 01/30/2026 11:53 (65), 03/11/2026 01:16 (12)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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