How severe is CVE-2026-25808?

CVE-2026-25808 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-25808 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25808?

CVE-2026-25808 affects Fedify Hollo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25808?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-25808 have an EU (EUVD) identifier?

Yes. CVE-2026-25808 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6393.

When was CVE-2026-25808 published?

CVE-2026-25808 was published on 2026-02-09 and last updated on 2026-06-17.

CVE-2026-25808

CVE-2026-25808 is a high-severity vulnerability in Fedify Hollo with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6393
Weakness: CWE-862
Affected product: Fedify Hollo
Published: 2026-02-09
Last modified: 2026-06-17

Description

Hollo is a federated single-user microblogging software designed to be federated through ActivityPub. Prior to 0.6.20 and 0.7.2, there is a security vulnerability where DMs and followers-only posts were exposed through the ActivityPub outbox endpoint without authorization. This vulnerability is fixed in 0.6.20 and 0.7.2.

Frequently asked questions

What is CVE-2026-25808?: Hollo is a federated single-user microblogging software designed to be federated through ActivityPub. Prior to 0.6.20 and 0.7.2, there is a security vulnerability where DMs and followers-only posts were exposed through the ActivityPub outbox endpoint without authorization. This vulnerability is fixed in 0.6.20 and 0.7.2.
How severe is CVE-2026-25808?: CVE-2026-25808 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-25808 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25808?: CVE-2026-25808 affects Fedify Hollo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25808?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-25808 have an EU (EUVD) identifier?: Yes. CVE-2026-25808 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6393.
When was CVE-2026-25808 published?: CVE-2026-25808 was published on 2026-02-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fedify:hollo:*:*:*:*:*:*:*:*

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