VulnerabilityPublished 13 Jul 2026

CVE-2026-45378: Decidim · Verification documents can be downloaded through reusable links

Affects decidim-verificationsSource GCVE Database

Not known to be exploited · CVSS 7.5 High : upgrade to 0.30.9 soon.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

7.5High

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

EPSS: 0.4% chance of exploitation in 30 days – higher than 35% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 0.30.9, 0.31.5, 0.32.0

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
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: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within 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 13 Jul 2026
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

Upgrade decidim-verifications to 0.30.9; decidim-verifications to 0.31.5; decidim-verifications to 0.32.0.

Affected software

Product	Affected	Fixed in
RubyGemsdecidim-verifications	Affected <0.30.9	Fixed in 0.30.9
RubyGemsdecidim-verifications	Affected >=0.31.0.rc1 <0.31.5	Fixed in 0.31.5
RubyGemsdecidim-verifications	Affected >=0.32.0.rc1 <0.32.0	Fixed in 0.32.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available in Decidim version 0.30.9 and later that addresses this issue by changing how verification documents are served. Until upgrading, organizations can mitigate risk by disabling the "Identity documents" verification feature. Since this is not a cloud service, remediation requires applying the official fix or disabling the affected feature. Patch status is confirmed by the referenced pull request (https://github.com/decidim/decidim/pull/16680).

Description

Decidim's verification admin workflow exposes scanned identity-document images through signed URLs that do not require authentication. These URLs remain valid for seven days, allowing anyone with the link to download sensitive verification documents without authorization. This vulnerability affects organizations using the "Identity documents" verification feature and risks leakage of highly sensitive personal information through various channels such as browser history, logs, or support workflows.

Impact

Any party that obtains a signed Active Storage URL can access and download scanned identity verification documents without authentication for up to seven days. This exposure risks leakage of highly sensitive personal information through common channels such as copied URLs, browser history, screenshots, logs, or support tickets. The vulnerability specifically impacts organizations using the "Identity documents" verification feature in Decidim, potentially leading to privacy violations and unauthorized data disclosure.

Summary

The vulnerability arises because Decidim uses Active Storage's signed disk URLs to serve scanned identity-document images in the verification admin UI. These URLs are embedded directly in the admin review pages and remain valid for seven days, effectively making the URL itself a bearer token. Since the URLs can be accessed without an authenticated session, anyone who obtains a URL can retrieve the associated document until the signature expires. This issue affects the verification_attachment blobs on Decidim::Authorization and is classified as broken access control (CWE-200).

CWE-200Exposure of Sensitive Information to an Unauthorized Actor (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #20OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design · Separation of Privilege
Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
OWASP Cheat Sheets
Error Handling (opens in a new tab)
Logging (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V8.3.4 (opens in a new tab)
V14.3.3 (opens in a new tab)
V7.3.3 (opens in a new tab)
Attack patterns
Subverting Environment Variable Values (opens in a new tab)
ICMP Echo Request Ping (opens in a new tab)
TCP SYN Scan (opens in a new tab)
Enumerate Mail Exchange (MX) Records (opens in a new tab)
DNS Zone Transfers (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 14 Jul 2026, 10:02 UTC

WeaknessesCWE-200

Technical details

References

Community reviews

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