Roundcube · Parser conflict
RoundCube Webmail Unsafe Deserialisation Vulnerability
At a glance
Actively exploited in the wild — prioritise confirming exposure.
Medium rather than High: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on Roundcube Webmail, treat it as High.
Briefing
- Do not treat uncorroborated claims as confirmed breaches.
Questions to ask IT
- Do we run Roundcube Webmail, and is every instance on a fixed release (1.5.10 or 1.6.11, or later)?
- Is any of it reachable from the internet?
- Have we checked whether it has already been used against us?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 16 Nov?
Next steps
- Confirm exposure, mitigation status and any service interruption risk.
Vulnerability facts
Full CVE detail CVE-2025-49113- 9.9 · CriticalExploitable over the network with a low-privilege account, and no one has to click or open anything. High impact on confidentiality, integrity and availability, and it can reach beyond the vulnerable system.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Listed: attacks using it have been seen (on the catalogue since )
- Elevated attack likelihood (~99.5% in 30 days)
- Before 1.5.10, 1.6.x before 1.6.11
- 1.5.10, 1.6.11
Versions are as the CVE record states them; check the vendor advisory before planning a fix.
No technical write-up beyond these facts and the summary below yet.
Next steps
- Confirm whether affected products/versions are present and prioritise patching or mitigations
Summary
- RoundCube Webmail contains a deserialization of untrusted data vulnerability that allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.
- CVE-2025-49113 is listed in known-exploited catalogue (exploitation in the wild)
- Authoritative catalogues report active exploitation of this vulnerability.
Why this matters in the UK
- Known-exploited catalogue reports exploitation in the wild
Products and services involved
- Roundcube Webmail98% match confidence · CVE-2025-49113
Part of SolarWinds Web Help Desk vulnerabilities
Pulse
Last checked 55m ago · Next recheck 10 Nov 2026, 02:09 UK time · 2 quiet checks collapsed
in the next 30 days first recorded at 99.5% (elevated likelihood signal, not confirmed exploitation). Suggested changed to 7d.
Elevated — confirm exposure; this is a probability signal, not confirmed exploitation.
2 quiet checks hidden.
Sources
RoundCube Webmail Deserialization of Untrusted Data Vulnerability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ConfirmedHeadline90% confidence
RoundCube Webmail Deserialization of Untrusted Data Vulnerability
- ConfirmedSummary fact75% confidence
RoundCube Webmail contains a deserialization of untrusted data vulnerability that allows remote code execution by authenticated users because the _from parameter in a URL is not validated in program/actions/settings/upload.php. Affects Roundcube Webmail. Known ransomware campaign use: Unknown. Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2025-49113
- ConfirmedKnown-exploited catalogue98% confidence
CVE-2025-49113 is listed in known-exploited catalogue (exploitation in the wild)