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VulnerabilityCVE-2025-49113Published 2025-06-02

CVE-2025-49113 — Roundcube Webmail

criticalCISA KEVPublic exploit11 PoC reposNuclei template

As of 2026-10-21, CVE-2025-49113 is a CRITICAL-severity vulnerability in Roundcube Webmail, CVSS v3.1 9.9, EPSS 98.9% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-02-20), with a US federal remediation deadline of 2026-03-13. Threadlinqs Intelligence links 9 tracked threat campaigns to CVE-2025-49113, most recently “Rapid7 Q3 2026 Threat Landscape: High-Severity Flaws Exploited in 3 Days as The Gentlemen and Qilin Ransomware Dominate”.

CVSS v3.1
9.9/10Critical
EPSS
98.9%Higher than 99.9% of scored CVEs
CISA KEV
ListedAdded · due 2026-03-13
Tracked threats
9Campaigns referencing it
Priority
9/10Threadlinqs triage score
Published
Updated 2026-10-21
CVSS v3.1 9.9 (CRITICAL) · EPSS 98.9% (higher than 99.9% of all scored CVEs) · Priority 9/10 · Published 2025-06-02

Last updated:

What is CVE-2025-49113?

Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.php, leading to PHP Object Deserialization.

The record classifies CVE-2025-49113 under weakness class CWE-502. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 2 vendors, listed below. The identifier was first published 528 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.9 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS (FIRST)
98.9% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
CISA KEV
Listed since 2026-02-20, federal remediation deadline 2026-03-13
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2025-06-02

Is CVE-2025-49113 being exploited?

CISA added CVE-2025-49113 to the Known Exploited Vulnerabilities catalog on 2026-02-20, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-03-13 under BOD 22-01. Weaponised exploit code for CVE-2025-49113 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2025/CVE-2025-49113.yaml). It currently carries a trending score of 60 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2025-49113

The record marks a vendor fix as available for CVE-2025-49113. Patch reference: https://github.com/roundcube/roundcubemail/commit/c50a07d88ca38f018a0f4a0b008e9a1deb32637e. Vendor advisory: https://github.com/roundcube/roundcubemail/commit/0376f69e958a8fef7f6f09e352c541b4e7729c4d. Because CVE-2025-49113 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-03-13. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2025-49113

9 tracked threats in the Threadlinqs corpus reference CVE-2025-49113, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, public proof-of-concept repositories, ProjectDiscovery Nuclei. This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

Showing 5 of 10 recorded references.