Page generated: 11 Nov 2026, 03:45 UTC
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CVE-2026-55255

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the v…

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Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.1.
CVSS 8.4 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
2.0/10
REALITY · THREAT PRIORITY
8.3/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 8.4: +1.26
  • Fresh EPSS: 0.89%: +0.00

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 11 documents and public datasets.

Hype components

Headline sample (25%)
70/100
Press, 30 days (60%)
5/100
Grounded branding (15%)
0/100
HYPE TOTAL20/100

Sources and documents

The Hacker News
Press · 15 Oct 2026, 07:00 · Langflow's Critical Authenticated RCE Flaw Targeted in 1,423 Honeypot Exploit Attempts - The Hacker News
Forkast News
Press · 09 Aug 2026, 07:00 · Seven Critical CVEs in 18 Months: Langflow’s Architecture Is the Vulnerability - Forkast News
forkast.news
Press · 06 Aug 2026, 07:00 · Remote Prompt Execution Is a New Vulnerability Class. ChatMate Just Showed How It Works on Copilot. - forkast.news
CryptoRank
Press · 06 Aug 2026, 07:00 · Remote Prompt Execution Is a New Vulnerability Class. ChatMate Just Showed How It Works on Copilot. - CryptoRank
Forkast News
Press · 05 Aug 2026, 07:00 · Critical RCE in IBM Langflow Triggers CISA Emergency Deadline - Forkast News
See all 11 source documents
VentureBeat
Press · 27 Jul 2026, 07:00 · Ransomware hits Langflow, can't collect ransom - VentureBeat
The Hacker News
Press · 08 Jul 2026, 07:00 · CISA Adds 4 Actively Exploited Adobe, Joomla, and Langflow Flaws to KEV - The Hacker News
SecurityWeek
Press · 08 Jul 2026, 07:00 · CISA Urges Immediate Patching of Exploited ColdFusion, Langflow, Joomla Flaws - SecurityWeek
BleepingComputer
Press · 08 Jul 2026, 07:00 · CISA orders feds to prioritize patching Langflow auth bypass flaw - BleepingComputer
SC Media
Press · 08 Jul 2026, 07:00 · CISA adds ColdFusion, Langflow, and Joomla bugs to known exploited vulnerabilities list - SC Media
Help Net Security
Press · 08 Jul 2026, 07:00 · Attackers using Langflow flaw for credential harvesting (CVE-2026-55255) - Help Net Security

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 2.0 · reality 8.3 (2026-11-02 15:14). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 8.4; EPSS 0.9%
Attention, last 30 days
1 distinct story titles; 1 press documents; 1 publisher domains.
Technical potential
network access, low privileges, no user interaction, additional attack conditions.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 14:00:15.521283+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
23 Jun 2026, 16:28
Added to the CISA KEV catalog
07 Jul 2026, 00:00
First press mention
08 Jul 2026, 07:00
Latest press mention
15 Oct 2026, 07:00
Score calculated
05 Nov 2026, 14:00