How severe is CVE-2026-39889?

CVE-2026-39889 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-2026-39889 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39889?

CVE-2026-39889 affects Praison Praisonai. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39889?

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-2026-39889 have an EU (EUVD) identifier?

Yes. CVE-2026-39889 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20636.

When was CVE-2026-39889 published?

CVE-2026-39889 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-39889

CVE-2026-39889 is a high-severity vulnerability in Praison Praisonai 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-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20636
Weakness: CWE-200
Affected product: Praison Praisonai
Published: 2026-04-08
Last modified: 2026-06-17

Description

PraisonAI is a multi-agent teams system. Prior to 4.5.115, the A2U (Agent-to-User) event stream server in PraisonAI exposes all agent activity without authentication. The create_a2u_routes() function registers the following endpoints with NO authentication checks: /a2u/info, /a2u/subscribe, /a2u/events/{stream_name}, /a2u/events/sub/{id}, and /a2u/health. This vulnerability is fixed in 4.5.115.

Frequently asked questions

What is CVE-2026-39889?: PraisonAI is a multi-agent teams system. Prior to 4.5.115, the A2U (Agent-to-User) event stream server in PraisonAI exposes all agent activity without authentication. The create_a2u_routes() function registers the following endpoints with NO authentication checks: /a2u/info, /a2u/subscribe, /a2u/events/{stream_name}, /a2u/events/sub/{id}, and /a2u/health. This vulnerability is fixed in 4.5.115.
How severe is CVE-2026-39889?: CVE-2026-39889 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-2026-39889 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39889?: CVE-2026-39889 affects Praison Praisonai. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39889?: 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-2026-39889 have an EU (EUVD) identifier?: Yes. CVE-2026-39889 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20636.
When was CVE-2026-39889 published?: CVE-2026-39889 was published on 2026-04-08 and last updated on 2026-06-17.

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-f292-66h9-fpmf

Affected products (1)

cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*

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