CVE-2026-21640

Name: CVE-2026-21640
Creator: NVD / NIST
Published: 2026-01-20T21:16:06.063+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 2.7/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2026-21640 is a low-severity vulnerability rated 2.7/10 on the CVSS scale. HackerOne community member Faraz Ahmed (PakCyberbot) has reported a format string injection in the Revive Adserver settings. When specific character combinations are used in a setting, the admin user console could be disabled due to a fatal PHP error.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

HackerOne community member Faraz Ahmed (PakCyberbot) has reported a format string injection in the Revive Adserver settings. When specific character combinations are used in a setting, the admin user console could be disabled due to a fatal PHP error.

Metrics

CVSS 3.1

2.7/10

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

CVSS 3.0

2.7/10

CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

EPSS Probability

0.21%

11.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-134

Affected Software

Vendor	Product	Versions
Aquaplatform	Revive Adserver	>= 6.0.0, <= 6.0.4

References

https://hackerone.com/reports/3445332Third Party Advisory

Timeline

Published: Jan 20, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21640?

How severe is CVE-2026-21640?

CVE-2026-21640 has a CVSS score of 2.7/10 (LOW severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21640?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21640?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST