VulnerabilityPublished 17 Mar 2026

CVE-2026-4308: frdel agent-zero · Server-Side Request Forgery

Affects frdel agent-zeroSource CVE Database V5

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Public exploit available · CVSS 5.3 Medium.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
frdelagent-zero	Affected =0.9.7	Fixed in–
agent0aiagent-zero	Affected =0.9.7	Fixed in–
GitHubfrdel/agent-zero`pkg:github/frdel/agent-zero`Other threats	Affected =0.9.7	Fixed in–

CPE configurations (1)

cpe:2.3:a:agent-zero:agent-zero:*:*:*:*:*:*:*:*

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AI-suggested

2) Implement strict input validation and sanitization on any user-controllable inputs related to document processing, especially those that influence URL or network requests. 3) Monitor and log outbound requests from the agent-zero server to detect anomalous or unexpected internal network access attempts. 4) Consider deploying web application firewalls (WAFs) with custom rules to detect and block SSRF patterns targeting the vulnerable function. 5) If feasible, isolate the agent-zero instance in a restricted network zone with minimal access to sensitive internal resources. 6) Regularly review and update access controls and credentials on internal services to reduce the risk of SSRF exploitation leading to further compromise. 7) Stay alert for vendor updates or community patches and apply them promptly once available.

Description

A weakness has been identified in frdel/agent0ai agent-zero 0.9.7. This affects the function handle_pdf_document of the file python/helpers/document_query.py. This manipulation causes server-side request forgery. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Impact

The SSRF vulnerability in agent-zero 0.9.7 can have significant impacts on organizations using this software. Attackers can leverage the flaw to access internal network resources that are otherwise inaccessible from the internet, potentially exposing sensitive data or internal services. This can lead to lateral movement within the network, reconnaissance, or pivoting to more critical systems. Confidentiality may be compromised if internal APIs or databases are accessed. Integrity and availability impacts are limited but possible if attackers use SSRF to trigger unintended actions or denial-of-service conditions on internal services. The medium CVSS score reflects moderate risk, but the public availability of exploit code increases the urgency. Organizations relying on agent-zero for document processing or related functions should consider this vulnerability a significant risk, especially in environments with sensitive internal infrastructure or weak network segmentation.

Summary

CVE-2026-4308 is a server-side request forgery vulnerability affecting frdel's agent-zero software, version 0.9.7. The issue resides in the handle_pdf_document function located in python/helpers/document_query.py, where improper input validation or sanitization allows an attacker to manipulate server requests. SSRF vulnerabilities enable attackers to coerce the vulnerable server into making arbitrary HTTP requests to internal or external systems, potentially bypassing network access controls. This can lead to unauthorized access to internal services, data exfiltration, or further exploitation of internal network components. The vulnerability can be exploited remotely without user interaction and requires only low-level privileges on the system. The exploit code has been publicly disclosed, increasing the risk of exploitation. Despite early notification, the vendor has not issued a patch or response, leaving users exposed. The CVSS 4.0 score of 5.3 reflects medium severity, factoring in the ease of exploitation, lack of user interaction, and limited scope of impact on confidentiality, integrity, and availability. No known active exploitation has been reported yet, but the availability of exploit code necessitates proactive mitigation.

References

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