How severe is CVE-2026-29200?

CVE-2026-29200 has a CVSS 4.0 base score of 9.9, rated critical severity.

Is CVE-2026-29200 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-29200?

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-2026-29200 have an EU (EUVD) identifier?

Yes. CVE-2026-29200 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26893.

When was CVE-2026-29200 published?

CVE-2026-29200 was published on 2026-05-04 and last updated on 2026-06-17.

CVE-2026-29200

CVE-2026-29200 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.9. 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-639.

Key facts

Severity: Critical (CVSS 4.0 base score 9.9)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26893
Weakness: CWE-639
Published: 2026-05-04
Last modified: 2026-06-17

Description

A critical IDOR vulnerability has been discovered in Comet Backup affecting all versions from 20.11.0 to 26.1.1 and 26.2.1. The vulnerability allows a tenant administrator to impersonate any end-user account of other tenants on the same server via a vulnerable API call.

Frequently asked questions

What is CVE-2026-29200?: A critical IDOR vulnerability has been discovered in Comet Backup affecting all versions from 20.11.0 to 26.1.1 and 26.2.1. The vulnerability allows a tenant administrator to impersonate any end-user account of other tenants on the same server via a vulnerable API call.
How severe is CVE-2026-29200?: CVE-2026-29200 has a CVSS 4.0 base score of 9.9, rated critical severity.
Is CVE-2026-29200 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-29200?: 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-2026-29200 have an EU (EUVD) identifier?: Yes. CVE-2026-29200 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26893.
When was CVE-2026-29200 published?: CVE-2026-29200 was published on 2026-05-04 and last updated on 2026-06-17.

References

https://support.cometbackup.com/hc/en-us/articles/40090945484823--CVE-2026-29200-%D0%A1ritical-IDOR-vulnerability-in-Comet-Backup

Other CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities

CVE-2024-34323 — Critical (CVSS 10.0): ProPhoenix Law RMS v2022.2403.3.101 was discovered to contain an Insecure Direct Object Reference (IDOR) via the…
CVE-2026-69865 — Critical (CVSS 10.0): Authorization bypass through user-controlled key in Microsoft Container Registry allows an unauthorized attacker to…
CVE-2026-83711 — Critical (CVSS 10.0): Authorization bypass through user-controlled key in Microsoft Azure Active Directory B2C allows an unauthorized…
CVE-2026-77998 — Critical (CVSS 10.0): Joomla Extension - miniorange.com - Unauthenticated Authentication Bypass via SAMLResponse Parameter in miniOrange SAML…
CVE-2026-77995 — Critical (CVSS 10.0): Joomla Extension - miniorange.com - Arbitrary account takeover in miniOrange OAuth Client < 3.2.0, OAuth Single Sign-On…
CVE-2025-40805 — Critical (CVSS 10.0): Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an…

Browse all CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities →