VulnerabilityPublished 19 Mar 2026

CVE-2026-3511: Slovensko.Digital Autogram · XML External Entity (XXE)

Affects Slovensko.Digital AutogramSource CVE Database V5

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Not known to be exploited · CVSS 8.6 High : upgrade to 2.7.2 soon.

Data as of 1 Nov 2026, 08:20 UTC

CVSS 3.1 base score

8.6High

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 26% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 2.7.2

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Changed
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: 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: 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 19 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 31 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

Upgrade Slovensko.Digital Autogram to 2.7.2.

Affected software

Product	Affected	Fixed in
Slovensko.DigitalAutogram	Affected <2.7.2	Fixed in 2.7.2
GitHubslovensko-digital/autogram`pkg:github/slovensko-digital/autogram`Other threats	Affected =0	Fixed in–

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

AI-suggested

To mitigate CVE-2026-3511, organizations should immediately implement the following specific measures: 1) Disable or properly configure XML external entity processing in the XML parser used by Autogram to prevent processing of external entities. This may involve updating XML parser libraries or applying secure parser configurations that disallow DTDs or external entity resolution. 2) Implement strict input validation and sanitization on XML inputs received at the /sign endpoint to detect and reject malicious payloads. 3) Employ network segmentation and firewall rules to restrict the local HTTP server’s ability to make outbound requests or access sensitive internal resources, limiting SSRF impact. 4) Monitor logs for unusual requests to the /sign endpoint containing XML payloads with entity declarations or suspicious patterns. 5) Educate users about phishing risks to reduce the likelihood of visiting malicious websites that trigger exploitation. 6) Coordinate with Slovensko.Digital for official patches or updates and apply them promptly once available. 7) Consider deploying Web Application Firewalls (WAFs) with rules targeting XXE and SSRF attack signatures to provide an additional layer of defense. These targeted mitigations go beyond generic advice by focusing on XML parser hardening, network controls, and proactive detection tailored to this vulnerability’s exploitation vector.

Description

Improper Restriction of XML External Entity Reference vulnerability in XMLUtils.java in Slovensko.Digital Autogram allows remote unauthenticated attacker to conduct SSRF (Server Side Request Forgery) attacks and obtain unauthorized access to local files on filesystems running the vulnerable application. Successful exploitation requires the victim to visit a specially crafted website that sends request containing a specially crafted XML document to /sign endpoint of the local HTTP server run by the application.

Impact

The primary impact of CVE-2026-3511 is unauthorized disclosure of sensitive local files and internal network resources due to SSRF facilitated by XXE attacks. Organizations running the vulnerable Autogram application risk exposure of confidential data, including configuration files, credentials, or other sensitive information stored on the local filesystem. This can lead to further compromise if attackers leverage disclosed information for lateral movement or privilege escalation. Since the attack requires no authentication and minimal user interaction, the attack surface is broad, especially in environments where users may be tricked into visiting malicious websites. The vulnerability does not directly affect data integrity or availability but significantly compromises confidentiality, which can undermine trust in affected digital services. Given the application’s likely use in Slovak digital identity or signing services, the impact could extend to critical government or citizen data, raising national security concerns. The absence of known exploits in the wild suggests a window for proactive mitigation before widespread exploitation occurs.

CWE-611Improper Restriction of XML External Entity Reference (opens in a new tab)
Base weaknessOWASP Top 10 A02:2025: Security Misconfiguration (opens in a new tab)
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
Implementation · System Configuration
Many XML parsers and validators can be configured to disable external entity expansion.
OWASP Cheat Sheets
Deserialization (opens in a new tab)
XML Security (opens in a new tab)
XML External Entity Prevention (opens in a new tab)
OWASP ASVS 4.0.3
V5.5.2 (opens in a new tab)
Attack patterns
Data Serialization External Entities Blowup (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 19 Mar 2026, 14:08 UTC

WeaknessesCWE-611

Technical details

References

Community reviews

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