CVE-2026-75007: Roundcube Webmail · Command Injection
Affects Roundcube WebmailSource CVE Database V5
Not known to be exploited · CVSS 5.4 Medium : upgrade to 1.7.3 or 1.6.18 when convenient.
Data as of 26 Oct 2026, 09:26 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 42% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Total control over the software or total information disclosure
CISA SSVC assessment, 2026-08-17.
- Patch
- Available – fixed in 1.7.3, 1.6.18
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 17 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Roundcube Webmail to 1.7.3 or 1.6.18.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| RoundcubeWebmail | Affected
| Fixed in
|
AI-suggested
Upgrade Roundcube Webmail to version 1.6.18 or 1.7.3 or later, where this vulnerability is fixed. No additional mitigation steps are indicated by the vendor advisory.
Description
CVE-2026-75007 is a command injection vulnerability in Roundcube Webmail versions before 1.6.18 and 1.7.3. The flaw arises from improper neutralization of special elements in the LDAP search filter due to unescaped %u/%fu/%d substitutions. This vulnerability can lead to information disclosure or privilege escalation. It has a medium severity rating with a CVSS score of 5.4. Fixed versions 1.6.18 and 1.7.3 are available.
References
- roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3 (opens in a new tab)
- github.com/roundcube/roundcubemail/releases/tag/1.6.18 (opens in a new tab)
- github.com/roundcube/roundcubemail/commit/e6cc1e121effeaec6d916feb4e019d2828924540 (opens in a new tab)
- github.com/roundcube/roundcubemail/releases/tag/1.7.3 (opens in a new tab)
- github.com/roundcube/roundcubemail/commit/0893e192adf803c7a5a89fafc80278257e1bcf65 (opens in a new tab)