Threat Intelligence / CVE / CVE-2025-49113

CVE-2025-49113 — Roundcube Webmail

CISA KEV
CVSS v3.1 9.9 (CRITICAL) · EPSS 91.5% (higher than 99.6% of all scored CVEs) · Priority 9/10 · Published 2025-06-02

As of 2026-02-23, CVE-2025-49113 is a CRITICAL-severity vulnerability in Roundcube Webmail, CVSS v3.1 9.9, EPSS 91.5% (99.6th 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 4 tracked threat campaigns to CVE-2025-49113, most recently “Microsoft August 2026 Patch Tuesday: 400 Flaws Fixed, Including Lazarus-Exploited Zero-Day CVE-2026-68820 (AFD.sys) and Two Publicly Disclosed Zero-Days (CVE-2026-62832 "LegacyHive", CVE-2026-72971)”.

Last updated: 2026-02-23

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 468 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)
91.5% probability of exploitation in the next 30 days, higher than 99.6% 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, last modified 2026-02-23

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. It currently carries a trending score of 40 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

4 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

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2025-49113 are available via the Threadlinqs MCP server (Purple tier). View plans →

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