Which products and versions are affected by CVE-2025-59716?

Affected: Guests (Owncloud). The full list is in the CVE brief.

Is CVE-2025-59716 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Apr 1, 2026.

Is CVE-2025-59716 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2025-59716?

Public exploit code is available.

Is there a fix for CVE-2025-59716?

Fixed versions are available, including Guests <=0.12.4, Guests 0.12.4.

How urgently should CVE-2025-59716 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2025-59716

Q: What is CVE-2025-59716?

ownCloud Guests before 0.12.5 allows unauthenticated user enumeration via the /apps/guests/register/{email}/{token} endpoint.

Q: How urgently should CVE-2025-59716 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

MediumExploitedPublic exploit

ownCloud Guests before 0.12.5 allows unauthenticated user enumeration via the /apps/guests/register/{email}/{token} endpoint.

Published Nov 5, 2025 · Updated Aug 12, 2026

Key Facts

Patch immediately

CVE-2025-59716 is a medium-severity vulnerability (CVSS 5.3 v3.1) affecting Guests (Owncloud).
It is exploited in the wild, listed in Industry KEV feed since Apr 1, 2026. Public exploit code is available.
EPSS estimates a 1.0% probability of exploitation in the next 30 days.
Fixed versions are available, including Guests <=0.12.4, Guests 0.12.4.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

5.3

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

EPSS (30-day exploit likelihood)

1.0%

Higher than 60.6% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2025-59716 brief as a PDF

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Description

ownCloud Guests before 0.12.5 allows unauthenticated user enumeration via the /apps/guests/register/{email}/{token} endpoint. Because of insufficient validation of the supplied token in showPasswordForm, the server responds differently when an e-mail address corresponds to a valid pending guest user rather than a non-existent user.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Apr 1, 2026	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
GuestsOwncloud	See advisory	0.12.4

Patched Releases

Guests

<=0.12.4

Timeline

Publicly disclosed
Nov 5, 2025
Added to Industry KEV feed
Apr 1, 2026
Last updated
Aug 12, 2026

Weakness Type

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-203 Observable Discrepancy

References

2 more references in the full CVE brief

FAQ

Common Questions.

ownCloud Guests before 0.12.5 allows unauthenticated user enumeration via the /apps/guests/register/{email}/{token} endpoint.
Affected: Guests (Owncloud). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Apr 1, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Guests <=0.12.4, Guests 0.12.4.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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