High Access control

CVE-2026-56835 — PraisonAI Slack app_mention bypasses configured user/channel authorization

PraisonAI is a multi-agent teams system. From version 3.11.0 to before version 4.6.59, PraisonAI's Slack bot applies its configured allowed_users, allowed_channels, and unknown-user pairing policy in the normal Slack message event handler, but not in the adjacent Slack app_mention event handler. A Slack workspace user who can mention the bot in a channel where the Slack app is present can trigger the configured PraisonAI agent even when: the sender is not in BotConfig.allowed_users; the channel is not in BotConfig.allowed_channels; unknown_user_policy="deny" is configured; and the same event content is correctly dropped by the normal message handler. This issue has been patched in version 4.6.59.

Published Oct 23, 2026 · Updated Oct 29, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: GitHub_M

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2
Technical severity (high)+6
CISA SSVC: exploitation "poc"+5

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.22%

ahead of 12% of scored CVEs · Oct 29, 2026

Affects

MervinPraison

PraisonAI and 1 more

CVSS base

8.3

High · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Pip Praisonai: fixed in version 4.6.59 — github.com (GitHub Security Advisories)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (MervinPraison PraisonAI, Pip Praisonai).
Apply the fixed version or the patch documented under Remediation.
Search available logs for exploit probes matching the vulnerability class (access control), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
MervinPraison	PraisonAI	version >= 3.11.0, < 4.6.59	Vulnerable	CVE Program (cve.org) e CISA ADP
Pip	Praisonai	≥ 3.11.0 and ≤ 4.6.58	Vulnerable	GitHub Security Advisories

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
8.3	CVSS 3.1	High	2.8	5.5	security-advisories@github.com via NIST National Vulnerability Database
8.3	CVSS 3.1	High	—	—	GitHub, Inc. via GitHub Security Advisories
8.3	CVSS 3.1	High	—	—	GitHub_M via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L (score shown at the top: security-advisories@github.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-862 · Missing Authorization

Other CVEs with this weakness →

EPSS over time FIRST

Oct 24, 2026 → Oct 29, 2026 · 6 reading(s) · max 0.37%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Audit administrative actions and access to resources outside each user’s normal pattern.

web/proxy/WAF logsnetwork IDS/IPSauthentication logsapplication logs

Timeline

What happened to this CVE, newest first.

2026
SSVC assessment updated
Oct 29, 2026 · CVE Program (cve.org) e CISA ADP
Fix documented
Oct 23, 2026 · GitHub Security Advisories
Affected products added · pip/praisonai
Oct 23, 2026 · GitHub Security Advisories
Affected products added · mervinpraison/praisonai
Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 23, 2026
CVSS changed · 8.3
Oct 23, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 23, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 23, 2026 · Alertas do Telegram
CVE published
Oct 23, 2026 · GitHub_M

Source activity

Repeated readings are counted rather than listed.

2× References added · Oct 23, 2026 – Oct 23, 2026
1× Official description updated · Oct 23, 2026 – Oct 23, 2026

References

2 on the record

github.com/advisories/GHSA-qvpf-j64c-jmhr
GitHub Security Advisories
github.com/MervinPraison/PraisonAI/security/advisories/GHSA-qvpf-j64c-jmhr
x_refsource_CONFIRM, NIST National Vulnerability Database

Elsewhere on this site

MervinPraison
every CVE for this vendor

Access control
same class

CWE-862
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-57144 PraisonAI SandlockSandbox falls back to unrestricted subprocess execution when Landlock is unavailable 7d
High CVE-2026-57121 PraisonAI: Missing ownership check on DELETE endpoints allows members to delete others' content in Platform API 7d
High CVE-2026-57142 PraisonAI recipe workflow policy can be bypassed by declaring and YAML-approving dangerous tools outside TEMPLATE.yaml 7d
High CVE-2026-57146 PraisonAI A2U incomplete authentication fix leaves current serve command unauthenticated by default 7d
High CVE-2026-57114 PraisonAI: Jobs webhook SSRF protection bypass via DNS rebinding 7d
High CVE-2026-57117 PraisonAI: Compute-bridged file tools allow shell command injection 7d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-56835 is "PraisonAI Slack app_mention bypasses configured user/channel authorization", rated High. It affects PraisonAI (MervinPraison); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.3 describes technical severity. EPSS 0.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.