CVE-2025-59716: ownCloud Guests before 0.12.5 allows unauthenticated user enumeration via the /apps/guests/register/{email}/{t

Q: How do I fix CVE-2025-59716?

guests: upgrade to newer than 0.12.4. Exact commands for each OS are on this page.

Q: Is CVE-2025-59716 being exploited?

CVE-2025-59716 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-59716 affect?

CVE-2025-59716 affects guests. Severity is medium (CVSS 5.3). 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

Q: How urgent is CVE-2025-59716?

Priority 44/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2025-59716 is a medium-severity flaw (CVSS 5.3) affecting guests. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-200, CWE-203
Published	2025-11-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: owncloud

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-05 17:15 UTCPublished CVE record published
2026-06-17 09:46 UTCUpdated Record last modified

owncloud guests UPGRADE

Affected: <= 0.12.4

Fixed in: newer than 0.12.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy guests || rpm -q guests || guests --version

2. UPGRADE to newer than 0.12.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade guests

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade guests

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: ownCloud Guests - User Enumeration

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-59716?

guests: upgrade to newer than 0.12.4. Exact commands for each OS are on this page.

Is CVE-2025-59716 being exploited?

CVE-2025-59716 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-59716 affect?

CVE-2025-59716 affects guests. Severity is medium (CVSS 5.3). 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

How urgent is CVE-2025-59716?

Priority 44/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

ownCloud vulnerabilities

References

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