CVE-2021-326888.8HighCWE-285

CVE-2021-32688: Application specific tokens can change their own scope

nextcloud · security-advisories

Vendor fix available · Affected: nextcloud security-advisories · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

2.3%probability of exploitation in the next 30 days

83rd percentile

050100

Higher than 83% of scored CVEs

8.8HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. These tokens are supposed to be granted to a specific applications (e.g. DAV sync clients), and can also be configured by the user to not have any filesystem access. Due to a lacking permission check, the tokens were able to change their own permissions in versions prior to 19.0.13, 20.0.11, and 21.0.3. Thus fileystem limited tokens were able to grant themselves access to the filesystem. The issue is patched in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds aside from upgrading.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

nextcloud · security-advisories< 19.0.13; >= 20.0.0, < 20.0.11; >= 21.0.0, < 21.0.3

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Improper Authorization · Access Control
Vendor: nextcloud
Published: July 2021
Band: Possible (1 to 10%), July 2021
Bounty reports: 1 disclosed on HackerOne

Disclosed bug bounty reports about CVE-2021-32688

The reports on HackerOne that name this CVE, with HackerOne's own outcome. Titles and metadata only.

Scoped apptokens can be changed by that very apptokenNextcloud · 2021 · high severityValid

CoverageNo articles yet

No CyberSIXT article names CVE-2021-32688 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.