CVE-2026-45810

Description

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 31.0.0 to before 31.0.12, and 32.0.0 to before 32.0.3, a missing check of a relation allowed authenticated users with access to any file comment, to read the content of all comments. It is recommended that the Nextcloud Server is upgraded to 31.0.12 or 32.0.3. It is recommended that the Nextcloud Enterprise Server is upgraded to 21.0.9.20, 22.2.10.35, 23.0.12.31, 24.0.12.30, 25.0.13.25, 26.0.13.22, 27.1.11.22, 28.0.14.13, 29.0.16.10, 30.0.17.5, 31.0.12 or 32.0.3

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CVSS v3.1 Score

6.8

MEDIUM

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

EPSS — Exploit Prediction

0.0025

Probability of exploitation

0.16%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-639 CWE-639

Affected Products

Vendor	Product	Versions
nextcloud	nextcloud_server	31.0.0 — 31.0.12
nextcloud	nextcloud_server	32.0.0 — 32.0.3
nextcloud	nextcloud_server	21.0.0 — 21.0.9.20
nextcloud	nextcloud_server	22.0.0 — 22.2.10.35
nextcloud	nextcloud_server	23.0.0 — 23.0.12.31
nextcloud	nextcloud_server	24.0.0 — 24.0.12.30
nextcloud	nextcloud_server	25.0.0 — 25.0.13.25
nextcloud	nextcloud_server	26.0.0 — 26.0.13.22
nextcloud	nextcloud_server	27.0.0 — 27.1.11.22
nextcloud	nextcloud_server	28.0.0 — 28.0.14.13
nextcloud	nextcloud_server	29.0.0 — 29.0.16.10
nextcloud	nextcloud_server	30.0.0 — 30.0.17.5
nextcloud	nextcloud_server	31.0.0 — 31.0.12
nextcloud	nextcloud_server	32.0.0 — 32.0.3

References

Advisories & Patches

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-285v-p9x9-cjhj https://github.com/nextcloud/server/pull/56982

Other References

https://hackerone.com/reports/3425534

Frequently Asked Questions

What is CVE-2026-45810? +

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 31.0.0 to before 31.0.12, and 32.0.0 to before 32.0.3, a missing check of a relation allowed authenticated users with access to any file comment, to read the content of all comments. It is recommended that the Nextcloud Server is upgraded to 31.0.12 or 32.0.3. It is recommended that the Nextcloud Enterprise Server is upgraded to 21.0.9.20, 22.2.10.35, 23.0.12.31, 24.0.12.30, 25.0.13.25, 26.0.13.22, 27.1.11.22, 28.0.14.13, 29.0.16.10, 30.0.17.5, 31.0.12 or 32.0.3 It has a CVSS v3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2026-45810? +

CVE-2026-45810 has a CVSS v3.1 score of 6.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0025, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-45810? +

CVE-2026-45810 affects products from nextcloud, specifically: nextcloud_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-45810? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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