VulnerabilityPublished 27 Mar 2026

CVE-2025-59031: Open-Xchange OX Dovecot Pro · Information Exposure

Affects Open-Xchange OX Dovecot ProSource CVE Database V5

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Not known to be exploited · CVSS 4.3 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

4.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Open-Xchange GmbHOX Dovecot Pro	Affected <=2.3.0	Fixed in–

AI-suggested

Users should avoid using the provided attachment-to-text conversion script that handles zip-style attachments unsafely. Instead, alternative tools such as FTS tika should be used for attachment text extraction. No urgent patch is currently documented, and no exploits are known.

Description

CVE-2025-59031 is a medium severity vulnerability in Open-Xchange GmbH's OX Dovecot Pro involving unsafe handling of zip-style attachments by a provided script for attachment to text conversion. Specially crafted OOXML documents can cause unintended files on the system to be indexed and included in full-text search (FTS) indexes, potentially exposing sensitive information to unauthorized actors. There are no known public exploits. Users are advised not to use the vulnerable script and instead use alternative tools such as FTS tika.

Impact

The impact is limited to unauthorized exposure of sensitive information due to unintended files being indexed and included in full-text search results. There is no impact on integrity or availability. The vulnerability requires an attacker with low privileges to supply a crafted OOXML document. No known exploitation has been reported.

Summary

The vulnerability arises from a script provided by Dovecot for converting attachments to text, which unsafely processes zip-style attachments. An attacker can craft OOXML documents that cause files not intended for indexing to be processed and included in full-text search indexes, leading to exposure of sensitive information. The CVSS 3.1 base score is 4.3 (medium severity), reflecting network attack vector, low complexity, requiring low privileges, no user interaction, and limited confidentiality impact.

References

documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Apr 2026, 13:33 UTC

Technical details

References

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