VulnerabilityPublished 29 Sep 2025

CVE-2025-57879: Esri Portal for ArcGIS · Open Redirect

Affects Esri Portal for ArcGISSource CVE Database V5

Not known to be exploited · CVSS 6.1 Medium.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 3.1 base score

6.1Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 15% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

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

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, 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: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
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 impacted component.
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 on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
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), the Metasploit, Exploit-DB and nuclei-templates index as of 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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
Esri Portal for ArcGIS	Affected =10.9.1	Fixed in–

AI-suggested

European organizations should implement several targeted mitigations beyond generic advice: 1) Monitor and audit all URLs generated by the Portal for ArcGIS to detect and block suspicious redirect parameters. 2) Employ web application firewalls (WAFs) with custom rules to detect and block open redirect attempts by validating redirect destinations against an allowlist of trusted domains. 3) Educate users about the risk of clicking on unexpected or suspicious links, especially those purporting to come from the Esri Portal. 4) Implement multi-factor authentication (MFA) on the portal to reduce the impact of credential theft resulting from phishing. 5) Regularly review and update URL handling logic in custom integrations or extensions of the portal to ensure no additional redirect vulnerabilities exist. 6) Stay alert for official patches or advisories from Esri and apply them promptly once available. 7) Use email security solutions that can detect and quarantine phishing attempts leveraging this vulnerability. These steps collectively reduce the risk of exploitation and limit the potential damage from successful phishing campaigns.

Description

There is an unvalidated redirect vulnerability in Esri Portal for ArcGIS 11.4 and below that may allow a remote, unauthenticated attacker to craft a URL that could redirect a victim to an arbitrary website, simplifying phishing attacks.

Impact

For European organizations using Esri Portal for ArcGIS, this vulnerability poses a significant risk to user trust and security posture. Since the portal is often used by government agencies, urban planners, environmental organizations, and private sector companies for geographic information system (GIS) data management and sharing, a successful phishing campaign leveraging this vulnerability could lead to credential compromise, unauthorized access to sensitive geospatial data, or broader network infiltration. The medium severity reflects that while direct system compromise is unlikely, the indirect consequences of phishing—such as data leakage or lateral movement—can be severe. European entities involved in critical infrastructure, urban planning, or environmental monitoring are particularly at risk, as attackers could use the open redirect to impersonate trusted portals and harvest credentials or distribute malware. Additionally, the scope change in the CVSS vector indicates that exploitation could affect resources beyond the initially targeted system, amplifying potential impact.

CWE-601URL Redirection to Untrusted Site ('Open Redirect') (opens in a new tab)
Base weaknessLikelihood of exploit: LowOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design
Use an intermediate disclaimer page that provides the user with a clear warning that they are leaving the current site. Implement a long timeout before the redirect occurs, or force the user to click on the link. Be careful to avoid XSS problems (CWE-79) when generating the disclaimer page.
Architecture and Design · Enforcement by Conversion
When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
OWASP Cheat Sheets
Mass Assignment (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V5.1.5 (opens in a new tab)
Attack patterns
Cross-Site Flashing (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

esri.com/arcgis-blog/products/trust-arcgis/administration/portal-for-arcgis-security-2025-update-3-patch (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Sep 2025, 18:41 UTC

WeaknessesCWE-601

Technical details

References

Community reviews

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