How severe is CVE-2026-42298?

CVE-2026-42298 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-42298 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42298?

CVE-2026-42298 affects Gitroom Postiz. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42298?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-42298 have an EU (EUVD) identifier?

Yes. CVE-2026-42298 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28849.

When was CVE-2026-42298 published?

CVE-2026-42298 was published on 2026-05-08 and last updated on 2026-06-17.

CVE-2026-42298

CVE-2026-42298 is a critical-severity vulnerability in Gitroom Postiz with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28849
Weakness: CWE-94
Affected product: Gitroom Postiz
Published: 2026-05-08
Last modified: 2026-06-17

Description

Postiz is an AI social media scheduling tool. Prior to commit da44801, a "Pwn Request" vulnerability in the Build and Publish PR Docker Image workflow (.github/workflows/pr-docker-build.yml) allows any unauthenticated user to execute arbitrary code during the Docker build process and exfiltrate a highly privileged GITHUB_TOKEN (write-all permissions). This can be achieved simply by opening a Pull Request from a fork with a maliciously modified Dockerfile.dev. This issue has been patched via commit da44801.

Frequently asked questions

What is CVE-2026-42298?: Postiz is an AI social media scheduling tool. Prior to commit da44801, a "Pwn Request" vulnerability in the Build and Publish PR Docker Image workflow (.github/workflows/pr-docker-build.yml) allows any unauthenticated user to execute arbitrary code during the Docker build process and exfiltrate a highly privileged GITHUB_TOKEN (write-all permissions). This can be achieved simply by opening a Pull Request from a fork with a maliciously modified Dockerfile.dev. This issue has been patched via commit da44801.
How severe is CVE-2026-42298?: CVE-2026-42298 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-42298 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42298?: CVE-2026-42298 affects Gitroom Postiz. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42298?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-42298 have an EU (EUVD) identifier?: Yes. CVE-2026-42298 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28849.
When was CVE-2026-42298 published?: CVE-2026-42298 was published on 2026-05-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:*

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