VulnerabilityPublished 6 Aug 2026

CVE-2026-53983: Efstratios Goudelis Ground Station · Server-Side Request Forgery (SSRF)

Affects Efstratios Goudelis Ground StationSource CVE Database V5

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Not known to be exploited · CVSS 9.2 Critical : upgrade to 0.6.0 as a priority.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 4.0 base score

9.2Critical

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

EPSS: 0.5% chance of exploitation in 30 days – higher than 47% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 0.6.0

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

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

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: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: High: There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: High: There is a total loss of confidentiality, resulting in all resources within the Subsequent System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
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.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Aug 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 5 Nov 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.

ghsa-77cr-rrgg-p4wf

What to do

Upgrade sgoudelis/ground-station to 0.6.0.

Affected software

Product	Affected	Fixed in
Efstratios GoudelisGround Station	Affected <0.6.0	Fixed in–
GitHubsgoudelis/ground-station`pkg:github/sgoudelis/ground-station`Other threats	Affected <0.6.0	Fixed in 0.6.0

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

AI-suggested

If you cannot patch yet, restrict access to the Socket.IO server on port 7000 to trusted clients only and disable or restrict CORS policies to prevent unauthorized connections. Additionally, implement input validation and scheme/host allowlisting on URLs accepted by the data_submission event to prevent injection of malicious URLs. Monitor and remove any attacker-supplied URLs from the database to stop recurring SSRF triggers.

Description

Ground Station versions prior to 0.6.0 contain an unauthenticated blind server-side request forgery (SSRF) vulnerability. This flaw allows any unauthenticated Socket.IO client to cause the server to issue outbound HTTP requests to attacker-controlled destinations. The vulnerability arises from disabled authentication enforcement, a wildcard CORS policy, and lack of validation on URLs stored and used in scheduled sync tasks. The malicious URL persists in the database and triggers repeated SSRF every 24 hours without requiring attacker presence.

Impact

The vulnerability allows unauthenticated remote attackers to perform blind SSRF attacks, potentially accessing internal network resources or cloud metadata services. The attacker can cause the server to make arbitrary HTTP requests, which may lead to information disclosure or further internal network reconnaissance. The persistence of the malicious URL in the database and its automatic re-execution every 24 hours increases the risk and duration of exploitation. However, raw response bodies are not leaked, limiting direct data exfiltration but still providing useful status and error information.

Summary

CVE-2026-53983 is a critical SSRF vulnerability in Efstratios Goudelis Ground Station before version 0.6.0. An unauthenticated attacker can connect to the Socket.IO server on port 7000, bypassing authentication due to disabled enforcement and a permissive CORS policy. The attacker submits a crafted URL via the data_submission event, which is stored without validation and used in periodic orbital sync tasks. The URL is passed directly to HTTP request functions without scheme or host restrictions, allowing requests to internal services, including cloud instance metadata endpoints. HTTP status codes and error messages are leaked via Socket.IO events, providing an oracle for internal resource probing. The persistent nature of the stored URL enables durable SSRF exploitation without continuous attacker connection.

CWE-918Server-Side Request Forgery (opens in a new tab)
Base weaknessCWE Top 25 (2025): #22OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Implementation · Operation
If there is a known list of applications, IP, hostname, and/or domains to which the product is allowed to communicate, then use allowlists to ensure that outgoing requests are restricted to these known entities. The allowlists could be in the application code or possibly enforced by firewalls or network segmentation.
Implementation · Operation
If the product is expected to be able to connect to arbitrary IP addresses or domains, consider using a denylist that includes private network addresses, internal domain names, etc. The denylist could be in the application code or possibly enforced by firewalls or network segmentation.
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.
OWASP Cheat Sheets
Server Side Request Forgery Prevention (opens in a new tab)
Unvalidated Redirects and Forwards (opens in a new tab)
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.6.1 (opens in a new tab)
V5.2.6 (opens in a new tab)
Attack patterns
Server Side Request Forgery (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 14 Aug 2026, 16:14 UTC

WeaknessesCWE-918

Technical details

References

Community reviews

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